Internal structure and patterns of distribution of mineral types of rare metal pegmatites in the Darai Pech valley (Kunar province, Afghanistan)-Reference-Cited by-同舟云学术

Internal structure and patterns of distribution of mineral types of rare metal pegmatites in the Darai Pech valley (Kunar province, Afghanistan)

Published:2024-07-12 Issue:3 Volume:0 Page:52-62
ISSN:1994-5655
Container-title:Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences
language:en
Short-container-title:

Author:

Evdokimov A.¹,Yusufzay A.²,Musazay A.²

Affiliation:

1. Saint-Petersburg Mining University

2. Kabul Polytechnic University

Abstract

The granite pegmatites of Afghanistan are known for deposits of rare metals: Li, Be, Cs, Ta, Nb, Rb, Sn, etc. Ores in the Darai Pech valley of the Kunar province contain crystals of beryl, spodumene, pollucite, and tantalite and are of interest to industry. The article discusses the petrographic features of pegmatite bodies, their internal structure, and the morphological parameters of ore bodies. Particular attention is paid to changes in the mineralogical composition of pegmatite bodies depending on the vertical distance from the parent intrusive rock. Over 20 pegmatite bodies have been studied. Four types of pegmatite veins are identified with distance from the granite intrusion: 1) essentially plagioclase-microcline, biotite-muscovite pegmatites with rare beryl, schorl, and garnet; 2) albitized microcline and microcline-albite pegmatites with coarse-crystalline beryl, tantalite-columbite, schorl, kunzite, and polychrome tourmaline; 3) albite pegmatites with rare spodumene, finely disseminated beryl, and columbite-tantalite; 4) albite-spodumene pegmatites with columbite-tantalite, cassiterite, clevelandite, lepidolite, kunzite, and polychrome tourmaline. Simultaneously, content of biotite decreases and those of muscovite and clevelandite increase, which positively correlates with contents of rare metal mineralization, piezo-optical raw materials, and precious stones. Individual pegmatite veins have asymmetrical zoning: the footwall has relatively fine- and medium-grained rocks and the hanging wall – coarse-grained rocks.

Publisher

Komi SC UB RAS

Reference29 articles.

1. Бескин, С. М. Особенности гранитовых систем с редкометалльными пегматитами / С. М. Бескин, Ю. Б. Марин // Записки Российского минералогического общества. – 2019. – Т. 148, № 4. – С. 1–16., Beskin, S. M. Osobennosti granitovykh sistem s redkometall’nymi pegmatitami [Features of granite systems with rare metal pegmatites] / S. M. Beskin, Yu. B. Marin // Zapiski Rossiiskogo Mineralogicheskogo Obshchestva [Letters of the Russian Mineralogical Society]. – 2019. – Vol. 148. – № 4. – P. 1–16.

2. London, D. Granitic pegmatites / D. London // Transactions of the Royal Society of Edinburgh : Earth Sciences. – 1996. – Vol. 87. – № 1–2. – P. 305–319., London, D. Granitic pegmatites / D. London // Transactions of the Royal Society of Edinburgh : Earth Sciences. – 1996. – Vol. 87. – № 1–2. – P. 305–319.

3. Alekseev, V. I. On the genesis of “white granite” from the Kester harpolith, Arga–Ynnakh–Khaya pluton, East Yakutia / V. I. Alekseev, Y. B. Marin // Russian Mineralogical Society. – 2021. – Vol. 62. – № 1. – P. 719–730., Alekseev, V. I. On the genesis of “white granite” from the Kester harpolith, Arga–Ynnakh–Khaya pluton, East Yakutia / V. I. Alekseev, Y. B. Marin // Russian Mineralogical Society. – 2021. – Vol. 62. – № 1. – P. 719–730.

4. London, D. A petrologic assessment of internal zonation in granitic pegmatites / D. London // Lithos. – 2014. – Vol. 184–187. – P. 74–104., London, D. A petrologic assessment of internal zonation in granitic pegmatites / D. London // Lithos. – 2014. – Vol. 184–187. – P. 74–104.

5. Černý, P. Rare-element granitic pegmatites. Part I : Anatomy and Internal Evolution of Pegmatite Deposits / P. Černý // Geoscience Canada. – 1991. – Vol. 18. – № 2. – P. 49–67., Černý, P. Rare-element granitic pegmatites. Part I : Anatomy and Internal Evolution of Pegmatite Deposits / P. Černý // Geoscience Canada. – 1991. – Vol. 18. – № 2. – P. 49–67.